A gas-removing device serves to remove impurity gases from the air
supplied to a fuel cell via an air supply system. The gas-removing device
includes a porous material and an alternate adsorption membrane. The
porous material has micropores formed therein in order to absorb impurity
gas particles contained in the air. The alternate adsorption membrane is
formed on the inner walls of the micropores of the porous material in
order to further adsorb and retain at least one type of impurity gas
particles from among the impurity gas particles absorbed by the porous
material. The alternate adsorption membrane includes at least one
positively charged layer and at least one negatively charged layer laid
alternately to one another.